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Luminescent Iridium(III) Complexes Supported by N-Heterocyclic Carbene-based (CCC)-C-Lambda-C-Lambda-Pincer Ligands and Aromatic Diimines
Lai-Hon Chung1; Hoi-Shing Lo1,2; Sze-Wing Ng1; Dik-Lung Ma3; Chung-Hang Leung4; Chun-Yuen Wong1,2
2015-10-21
Source PublicationSCIENTIFIC REPORTS
ISSN2045-2322
Volume5
Abstract

Iridium(III) hydrido complexes containing N-heterocyclic carbene (NHC)-based pincer ligand 1,3-bis(1-butylimidazolin-2-ylidene)phenyl anion (C1^C^C1) or 1,3-bis(3-butylbenzimidazolin-2-ylidene)phenyl anion (C2^C^C2) and aromatic diimine (2,2′-bipyridine (bpy), 1,10-phenanthroline (phen), 4,4′-dimethyl-2,2′-bipyridine (Me2bpy), or dipyrido-[3,2-f:2′,3′-h]-quinoxaline (dpq)) in the form of [Ir(C^C^C)(N^N)(H)]+ have been prepared. Crystal structures for these complexes show that the Ir–CNHC distances are 2.043(5)–2.056(5) Å. The hydride chemical shifts for complexes bearing C1^C^C1 (−20.6 to −20.3 ppm) are more upfield than those with C2^C^C2 (−19.5 and −19.2 ppm), revealing that C1^C^C1 is a better electron donor than C2^C^C2. Spectroscopic comparisons and time-dependent density functional theory (TD-DFT) calculations suggest that the lowest-energy electronic transition associated with these complexes (λ = 340–530 nm (ε ≤ 103 dm3 mol−1 cm−1)) originate from a dπ(IrIII) → π*(N^N) metal-to-ligand charge transfer transition, where the dπ(IrIII) level contain significant contribution from the C^C^C ligands. All these complexes are emissive in the yellow-spectral region (553–604 nm in CH3CN and CH2Cl2) upon photo-excitation with quantum yields of 10−3–10−1.

DOI10.1038/srep15394
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000363287300002
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Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionInstitute of Chinese Medical Sciences
Affiliation1.Department of Biology and Chemistry, City University of Hong Kong, SAR, Tat Chee Avenue, Kowloon, Hong Kong
2.State Key Laboratory of Millimeter Waves, City University of Hong Kong, SAR, Tat Chee Avenue, Kowloon, Hong Kong
3.Department of Chemistry, Hong Kong Baptist University, SAR, Kowloon Tong, Hong Kong
4.State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China
Recommended Citation
GB/T 7714
Lai-Hon Chung,Hoi-Shing Lo,Sze-Wing Ng,et al. Luminescent Iridium(III) Complexes Supported by N-Heterocyclic Carbene-based (CCC)-C-Lambda-C-Lambda-Pincer Ligands and Aromatic Diimines[J]. SCIENTIFIC REPORTS,2015,5.
APA Lai-Hon Chung,Hoi-Shing Lo,Sze-Wing Ng,Dik-Lung Ma,Chung-Hang Leung,&Chun-Yuen Wong.(2015).Luminescent Iridium(III) Complexes Supported by N-Heterocyclic Carbene-based (CCC)-C-Lambda-C-Lambda-Pincer Ligands and Aromatic Diimines.SCIENTIFIC REPORTS,5.
MLA Lai-Hon Chung,et al."Luminescent Iridium(III) Complexes Supported by N-Heterocyclic Carbene-based (CCC)-C-Lambda-C-Lambda-Pincer Ligands and Aromatic Diimines".SCIENTIFIC REPORTS 5(2015).
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